摘要: 链接: http://codeforces.com/problemset/problem/600/E 题意: You are given a rooted tree with root in vertex 1. Each vertex is coloured in some colour. Let' 阅读全文
posted @ 2020-01-21 20:31 YDDDD 阅读(204) 评论(0) 推荐(0) 编辑